Sand bag



Feb. 5, 1929. 1,700,979

N. s. DODGE SAND BAG Filed Deo. 22, 1926 INVENTOR.

ATToRNE-Ys.

Feta. 5, l929.

Uhll'll) STATES NATHANIFL S. DODGE, OF PIEDMONT, CALIFDRNIA.

SAND BAG.

Application filed December 22, 1926. Serial No. 156,418.

'.lhis invention relates to sand bags and particularly that typeemployed in vulcanizing automobile tires.

lt has been customary. in the past, 'to Weave the sand in straightlengths With a Warp thread running lengthwise and the rsa1-p thread ofuniform diameter. In actual practice, the bags are filled With sand andthe ends are tied. The are then placed interiorly of the tires, Whenthese are placed in the vulcanizingl machines and as such the bags mustbe bent to conform to the interior curved surface of the tire. The bagswear out on the exterior surface Where they come in contact with thetire and they, furthermore, have a tendency to ltinlr thus presenting anuneven surface to the tire. The warp thread kis also placed understresses when bent to conform to the curve of the tire and Wear and tearis thus further increased.

rlhe object of the present invention is to generally improve andsimplify the construction and operation of sand bags of the characterdescribed; to provide a tubular elongated sand bag which is Woven on thearc of a circle thereby reducing the bending action when the bag isinserted in the tire and eliminating stresses in the Warp thread andfurther to provide a sand bag in which the Warp thread is arranged insections, an inner section consisting of a comparatively fine warpthread, an intermediate section consisting of coarser Warp thread and aneX terior section consisting of a still coarser or heavier Warp thread.The employment of the coarser thread in the exterior section is of greatimportance as it presents a heavier fabric and, accordingly, resistsWear to a greater degree.

The invention is shown by Way of illustration in the accompanyingdrawings in which Figure l is a partial side elevation of the sand bag,

Figure 2 is a cross section of the same,

Figure 8 is a sectional view of a portion of a vulcanizing machineshowing the position of the tire and sand bagtherein.

Referring to the drawings in detail, and particularly Figure l, it Willbe noted that the bag is Woven in the form of a semi-circle when viewedfrom a side elevation and further that a Warp or longitudinally runningthread of varying diameter is employed. The Warping thread is preferablyarranged in three sections indicated at A, B and C. The sectionindicated at l Will hereinafter be referred to as the inner section. thesection indicated at B as the intermediate section and the sectionindicated at C as the outer section. The Warp thread employed in theinner section is comparatively tine? as indicated at 2, the Warp threademployed in the intermediate section is coarser, as indicated at 3 andthe Warp thread employed in. the outer section is still coarser orheavier, indicated at et. The result produced is an elongated tubularfabric bag which is semi-circle in side elevation and substantiallycircular in cross section.

In actual practice7 the bag is filled with sand and the ends are tiedtogether, as indicated at 5 (see Figure The bag is placed Within thetire shown at 6 and the bagg together with the tire is placed within thevulcanizing machine. The exterior or coarse surface of the sand bagindicated at C comes in contact with the inner surface of the tire andthe innermost section of the sand is engaged by a clamping shoe 7 Whichforces the sand bag snugly against the inner surface of the tire and assuch holds the tire against the mold surface, the clamping shoe being7of course, held in position by clamping screws or the like indicated at8.

As previously stated, the exterior surface of the bag or that surfacewhich contacts with the inner surface of the tire is subjected to thegreatest Wear. This is taken care of in the present instance byemploying a coarse Warp thread. The intermediate section and the innersection is subjected `to less Wear and as such may be Woven from a.liner thread. Employment of a Warp thread of gradually increasingdiameter of further importance. as it permits greater llexibil ity orbending action as far as the sand bag is concerned. This bending actionis again materially promoted due to the fact that the bag` is Woven inthe form of a semi-circle or arc and lrinking of the bag when placedWithin the tire is thus positively avoided.

lVhile certain features of the present invention are more or lessspecifically described, I Wish it understood that various changesmay beresorted to Within the scope ofthe appended claims. Similarly that thematerials and linishes of the several part-s employed may be such as themanufacturer may desire or varying conditions or uses may demand.

Having thus described my invention. What I claim and desire to secure byLetters Patent is l. A device of the character described comprising anelongated tubular fabric bag, in which the warp and filler threads areWoven to form a tubular bag which is arcuate shaped in side elevationand substantially cylindrical in cross section, said Warp threads beingcomparatively fine at the inner surface and comparatively coarse at theouter surface.

2. A device of the character described comprising an elongated tubularfabric bag in which the warp thread runs longitudinally of the bag, andincreases in diameter from the inner to the outer surface, the threadbeing comparativel).7 line at the inner surface and comparatively coarseat the outer surface.

3. A device of the character described comprising an elongated tubularfabric bag in which the Warp thread runs longitudinally of the bag andis arranged in three sections, an inner, an intermediate and an outersection, said inner section consisting of a comparatively fine Warpthread, the intermediate section consisting of a| coarser Warp threadand the exterior section consisting of a still coarser Warp thread.

4;. A device of the character described comprising an elongated tubularfabric bag in Which the Warp thread runs longitudinallyv of the bag andincreases in diameter from the inner to the outer surface, the threadbeing comparatively fine at the inner surface and comparatively coarseat the outer surface, said bag being Woven in the shape of a semicirclewhen viewed from the side.

5. A device of the character described comprising an elongated tubularfabric bag in Which the Warp thread runs longitudinally of the bag andis arranged in three sections, an inner` an intermediate and an outersection, said inner section consisting of a comparatively line Warpthread, the intermediate section consisting of a coarser warp thread andthe exterior section consisting of a still coarser Warp thread, said bagbeing woven in the form of a semi-circle when viewed from the side andbeing` substantially circular in cross section.

NATHANIEL S. DODGE.

